@article{JEMS_2016_18_6_a4,
     author = {Cyril Imbert and Luis Silvestre},
     title = {Estimates on elliptic equations that hold only where the gradient is large},
     journal = {Journal of the European Mathematical Society},
     pages = {1321--1338},
     publisher = {mathdoc},
     volume = {18},
     number = {6},
     year = {2016},
     doi = {10.4171/jems/614},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/jems/614/}
}